81115503 has 32 divisors (see below), whose sum is σ = 135782400. Its totient is φ = 41998176.

The previous prime is 81115469. The next prime is 81115513. The reversal of 81115503 is 30551118.

It is not a de Polignac number, because 81115503 - 2⁶ = 81115439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81115513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4758 + ... + 13596.

It is an arithmetic number, because the mean of its divisors is an integer number (4243200).

Almost surely, 2^81115503 is an apocalyptic number.

81115503 is a deficient number, since it is larger than the sum of its proper divisors (54666897).

81115503 is a wasteful number, since it uses less digits than its factorization.

81115503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 81115503 is about 9006.4145474212. The cubic root of 81115503 is about 432.8804328624.

It can be divided in two parts, 81115 and 503, that added together give a palindrome (81618).

The spelling of 81115503 in words is "eighty-one million, one hundred fifteen thousand, five hundred three".